drm/i915: Use VMA directly for checking tiling parameters

v2: Rename functions to suit their more active role

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Reviewed-by: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/1471254551-25805-14-git-send-email-chris@chris-wilson.co.uk

drivers/gpu/drm/i915/i915_gem_tiling.c

@@ -116,35 +116,46 @@ i915_tiling_ok(struct drm_device *dev, int stride, int size, int tiling_mode)
 	return true;
 }
 
-/* Is the current GTT allocation valid for the change in tiling? */
-static bool
-i915_gem_object_fence_ok(struct drm_i915_gem_object *obj, int tiling_mode)
+/* Make the current GTT allocation valid for the change in tiling. */
+static int
+i915_gem_object_fence_prepare(struct drm_i915_gem_object *obj, int tiling_mode)
 {
 	struct drm_i915_private *dev_priv = to_i915(obj->base.dev);
+	struct i915_vma *vma;
 	u32 size;
 
 	if (tiling_mode == I915_TILING_NONE)
-		return true;
+		return 0;
 
 	if (INTEL_GEN(dev_priv) >= 4)
-		return true;
+		return 0;
+
+	vma = i915_gem_obj_to_ggtt(obj);
+	if (!vma)
+		return 0;
+
+	if (!obj->map_and_fenceable)
+		return 0;
 
 	if (IS_GEN3(dev_priv)) {
-		if (i915_gem_obj_ggtt_offset(obj) & ~I915_FENCE_START_MASK)
-			return false;
+		if (vma->node.start & ~I915_FENCE_START_MASK)
+			goto bad;
 	} else {
-		if (i915_gem_obj_ggtt_offset(obj) & ~I830_FENCE_START_MASK)
-			return false;
+		if (vma->node.start & ~I830_FENCE_START_MASK)
+			goto bad;
 	}
 
 	size = i915_gem_get_ggtt_size(dev_priv, obj->base.size, tiling_mode);
-	if (i915_gem_obj_ggtt_size(obj) != size)
-		return false;
+	if (vma->node.size < size)
+		goto bad;
 
-	if (i915_gem_obj_ggtt_offset(obj) & (size - 1))
-		return false;
+	if (vma->node.start & (size - 1))
+		goto bad;
 
-	return true;
+	return 0;
+
+bad:
+	return i915_vma_unbind(vma);
 }
 
 /**
@@ -168,7 +179,7 @@ i915_gem_set_tiling(struct drm_device *dev, void *data,
 	struct drm_i915_gem_set_tiling *args = data;
 	struct drm_i915_private *dev_priv = to_i915(dev);
 	struct drm_i915_gem_object *obj;
-	int ret = 0;
+	int err = 0;
 
 	/* Make sure we don't cross-contaminate obj->tiling_and_stride */
 	BUILD_BUG_ON(I915_TILING_LAST & STRIDE_MASK);
@@ -187,7 +198,7 @@ i915_gem_set_tiling(struct drm_device *dev, void *data,
 
 	mutex_lock(&dev->struct_mutex);
 	if (obj->pin_display || obj->framebuffer_references) {
-		ret = -EBUSY;
+		err = -EBUSY;
 		goto err;
 	}
 
@@ -234,11 +245,9 @@ i915_gem_set_tiling(struct drm_device *dev, void *data,
 		 * has to also include the unfenced register the GPU uses
 		 * whilst executing a fenced command for an untiled object.
 		 */
-		if (obj->map_and_fenceable &&
-		    !i915_gem_object_fence_ok(obj, args->tiling_mode))
-			ret = i915_vma_unbind(i915_gem_obj_to_ggtt(obj));
 
-		if (ret == 0) {
+		err = i915_gem_object_fence_prepare(obj, args->tiling_mode);
+		if (!err) {
 			if (obj->pages &&
 			    obj->madv == I915_MADV_WILLNEED &&
 			    dev_priv->quirks & QUIRK_PIN_SWIZZLED_PAGES) {
@@ -281,7 +290,7 @@ err:
 
 	intel_runtime_pm_put(dev_priv);
 
-	return ret;
+	return err;
 }
 
 /**